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Fluke Quartz-Sheath SPRTs


All the features you expect in world-class SPRTs

  • Drift rates as low as 0.0005 K
  • Proprietary gas mixture ensures high stability
  • Most experienced SPRT design team in the business

Choosing the right platinum thermometer as your primary standard may be the most critical purchase decision in your lab. Unfortunately, other manufacturers are pretty secretive about how their SPRTs are made. They won’t tell you much more than you can already see by looking at one. Long-term reputation used to be a reliable indicator, but the leaders of a few decades ago have lost their original craftsmen and design scientists. There are only a few active SPRT design groups in the world today.









Temperature Range –200 °C to
670 °C
–200 °C to
480 °C
0 °C to
1070 °C
0 °C to 1070 °C
Nominal RTPW 25.5 Ω 0.25 Ω 2.5 Ω
Current 1 mA 14.14 mA 5 mA
Resistance Ratio W(302.9146 K) ≥ 1.11807 and
W(234.3156 K) ≤ 0.844235
W(302.9146 K) ≥ 1.11807 and
W(1234.93 K) ≥ 4.2844
Sensitivity 0.1 Ω/°C 0.001 Ω/°C 0.01 Ω/°C
Drift Rate < 0.002 °C/100
hours at
661 °C (typically < 0.001 °C)
< 0.001 °C/100 hours at
480 °C (0.0005 °C typical)
< 0.003 °C/100 hours at 1070 °C
(typically < 0.001 °C)
Sensor Support Quartz glass cross Quartz glass
strip with notches
Quartz glass cross
Diameter of Sensor
Pt Wire

0.07 mm (0.003 in)

0.4 mm (0.016 in) 0.2 mm (0.008 in)
Protective Sheath Quartz glass, Diameter: 7 mm (0.28 in), Length: 520 mm (20.5 in) Quartz glass, Diameter: 7 mm (0.28 in), Length: 680 mm (26.8 in)

The official maximum temperature of an SPRT as a defining interpolation instrument of the ITS-90 is 961.78 °C, but these types of SPRTs were found to be stable up to at least 1070 °C. The annealing temperature during the stability test was 1085 °C. The lower temperature limit of these types of SPRTs can be as low as –200 °C.
In general, it is suggested that a 25-ohm SPRT be used below 0 °C.













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